Three cases of Xingtai M_S5.8,Heze M_S5.9 and Sheyang M_S5.1 earthquakes are chosen and the fracture feature of moderate and small shocks before the earthquakes are studied. The result shows:1. The shocks occurred during the seismogenic period show ten dency of unilateral fracture; 2. The shocks before Xingtai and Heze earthquakes possess a dominant direction of fracture plane,that is similar or conjugate to the strikes of seismic belts and fracture planes of main earthquakes; 3. The environment stress τ₀ of the shocks before the earthquakes is slightly larger than those during the normal period; 4. There is not a dominant direction of fracture plane for the shocks before Sheyang earthquake, therefore it is deduced that there is not seismic belt before the event; 5. Before Heze and Sheyang earthquakes,the moderate and small shocks occurred on the edge of seismic gaps show tendency of unilateral fracture, and their directions of principal fracture generally do not point to the interior of gaps.